Almandine and Alunite Physical Properties

Almandine

Alunite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

3.95-4.30

2.6-2.9

1.5 Fracture

Conchoidal, Brittle, Conchoidal, Brittle, Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal

Conchoidal, Uneven

1.6 Cleavage

none

On {0001}, perfect

1.7 Mohs Hardness

7-7.5

3.5-4

1.8 Chemical Composition

Fe 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)

KAl3(SO4)2(OH)6

Almandine and Alunite Chemical Formula

While comparing Almandine and Alunite physical properties, the important data you should know is its chemical composition. Since chemical formula defines the molecular structure of the crystal, most of the physical properties like color, tenacity, solubility are governed by Almandine and Alunite chemical formula.

Chemical formula of Almandine- Fe 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
Chemical formula of Alunite- KAl3(SO4)2(OH)6

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Almandine and Alunite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Almandine and Alunite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Almandine and Alunite Optical Properties during the identification of gemstone. Specific gravity of Almandine is 2.6-2.9 whereas that of Alunite is 2.6-2.9.